Fan mounting



L. C. REED Aug. 13, 1940.

FAN MOUNTING Filed Nov. 13, 1939 Z. 6. Reed Inventor liar-n63 Patented Aug. 13, 1940 iTEN'i' FFECE FAN MOUNTING Lyman 0. Reed,

New Orleans, La.

Application November 13, 1939, Serial No. 304,220

8 Claims.

This invention relates to ventilating fans and more particularly to the mounting thereof, having for its object to provide a construction which is simple in parts and more eiiicient in operation than those heretofore disclosed.

With these and other objects in View the invention resides in the novel details of construction and combinations of parts as will be disclosed more fully hereinafter and particularly 0 pointed out in the claims.

Referring to the accompanying drawing forming a part of this specification and in which like numerals designate like parts in all the views Fig. 1 is a front elevation of a fan mounted within its casing; and

Fig, 2 is a side elevation thereof.

Heretofore ventilating fans have been mounted entirely within the casing provided therefor, whereby the air forced radially off the fan blades has impinged upon and been thwarted by the wall of the casing. In other prior constructions the casing has been of rectangular formation, the rear wall being provided with a circular air discharge opening, thereby providing a plurality of substantially triangular pockets having the back wall disposed transversely of and thwarting the directional flow of air through the casing.

This invention, on the other hand, provides a construction permitting all of the air to have a substantially unobstructed flow through the cas ing, as well as permitting the air forced radially off the fan blades to pass from the discharge end of the casing with substantially no obstruction thereto by any part of the casing. In addition, the rotating fan blades are so constructed and mounted as to slightly deflect the radial flow of the air from each blade in a direction away from the casing and beyond the discharge end thereof.

More specifically, and with reference to the drawing, a casing or housing is indicated by the numeral 2, it being formed of sheet material and made conical, with the largest diameter at the intake side and the smallest diameter at the discharge side thereof, the conical wall having no transverse extension at the discharge side, whereby the air flowing through the casing in the direction of the arrows will have no obstruction at said discharge end. The casing may be mounted in any suitable manner with its axis horizontal as shown in the drawing, or with the axis in any other position, any suitable framework being provided for maintaining the casing in place. Thus, the casing may be mounted in a vertical wall or it may be mounted in the space between a ceiling and a floor thereabove, the latter mounting being particularly adaptable for so-called attic ventilation where the air of a house or other building is discharged into the attic space for ultimate passage to the outside atmosphere.

A shaft indicated at 3 is mounted axially of the casing and provided with any means for rotating the same as by the pulley 5. On said shaft is mounted a hub 53 to which is secured a plurality of fan blades generally identified by the numeral 8, each blade being angularly disposed as shown with reference to the axis of the shaft so as to force the air rearwardly of the fan as the blades rotate, such angularity being not over 45.

The outer end of each blade is obliquely formed W with respect to the front and rear edges of the blade, the forward or leading edge of the blade having a lesser radial extent than the rear or trailing edge, as clearly indicated in Fig. 2, and each blade is of a length to slightly more than just clear the wall of the casing. In other wordsf-ELO the outermost or end edges of all the blades substantially lie in a conical plane, the pitch of which plane is opposite to the pitch of the conical Wall of the casing 2. In addition, the fan is so mounted with respect to the casing that the forward 25 edge portions of the fan blades lie entirely within the casing whereas the rear edge portions of said blades lie entirely outside said casing and, for the most practical purposes, the fan is centered on the plane of the discharge end of the casing." 30 Stated in other words, a plane passed through the discharge end of the casing will be substantially perpendicular to the axis of the shaft 3, and will bisect all of the blades of the fan as a unit.

Thus it will be understood that upon rotation of the fan, air will be drawn in the direction of the arrows i into the casing and converged by the conical wall thereof to the fan blades which have a screw-action on the column of air and 40 discharge the air generally in the same axial path which it had in passing through the casing, as indicated by the arrows 8. However, due to the angularity or pitch of the blades, and the fact that the rear or trailing edge of each blade is 45 longer than the forward or leading edge, some of the air will be given a diagonal travel across each blade as indicated by the arrows 9 and leave each blade at the corner in thereof which is farthest from the axis of the fan, and this portion of the 50 air will entrain the portion of air which has been in contact with the conical surface of the casing, both of such portions ultimately being discharged in the direction of the arrows Ii, Thus it may be said that by this construction the fan creates two conical paths of air, one path being the intake and having one pitch direction, and the other being the discharge and having an opposite pitch direction, whereby the discharged air will diifuse to a greater extent within the space receiving it. Also it is to be observed that the air flow through the casing and fan has an uninterrupted or smooth path whereby all particles of the air stream have continuous movement with no eddies or counter-flow.

It is obvious that those skilled in the art may vary the details of construction and arrangements of parts without departing from the spirit of this invention and therefore it is desired not to be limited to the exact foregoing disclosure except as may be demanded by the claims.

What is claimed is:

1. A ventilating fan comprising a housing and a plurality of air impelling blades mounted for rotation therein, the housing consisting of a conical wall terminating in and providing intake and discharge openings for the air as well as providing an unobstructed surface for the passage of air through said housing, the blades extending substantially radially from a hub mounted upon a shaft disposed substantially coaxially of said housing, the blades and hub as a unit disposed within the discharge opening so that each blade is substantially one-half inside and one-half outside said housing, the extreme end edge of each blade oblique to the side edges thereof and relatively closely fitting the periphery of the discharge opening, the end edges of all the blades disposed in a conical plane having an obliquity substantially opposite to the obliquity of the conical Wall of said housing.

2. A ventilating fan comprising a housing and a plurality of air impelling blades mounted for rotation therein, the housing consisting of a conical Wall terminating in and providing intake and discharge openings for the air as well as providing an unobstructed surface for the passage of air through said housing, the blades extending substantially radially from a hub mounted upon a shaft disposed substantially coaxially of said housing, the blades and hub as a unit disposed within the discharge opening so that each blade is substantially one-half inside and one-half outside said housing, the extreme end edge of each blade oblique to the side edges thereof and relatively closely fitting the periphery of the discharge opening, the obliquity of the end edge being such that the trailing side edge of the blade is longer than the leading side edge thereof, the end edges of all the blades disposed in a conical plane having an obliquity substantially opposite to the obliquity of the conical wall of said housing.

3. A ventilating fan comprising a housing and a plurality of air impelling blades mounted for rotation therein, the housing consisting of a conical wall terminating in and providing intake and discharge openings for the air as Well as providing an unobstructed surface for the passage of air through said housing, the blades mounted upon a shaft disposed substantially coaxially of said housing, the blade assemblage disposed Within the discharge opening so that each blade is substantially one-half inside and onehalf outside said housing, the extreme end edge of each blade so formed that all of the end edges of the blades lie substantially in a conical plane having an obliquity substantially opposite to the obliquity of the conical wall of said housing.

4. In a ventilating fan the combnation of a conical housing having an air intake and an air discharge; and a plurality of impelling blades mounted for rotation at the discharge of said housing, said blades having their end edges dis-- posed in a conical plane of a pitch opposite to the pitch of said housing.

5. In a ventilating fan the combination of a conical housing having an air intake and an air discharge; and a plurality of air impelling blades mounted for rotation at the discharge of said housing, said blades having their end edges disposed in a conical plane substantially coaxial with the plane of said housing but having a pitch opposite to the pitch of said housing.

6. In a ventilating fan the combination of a conical housing having an air intake and an air discharge; and a plurality of air impelling mounted for rotation at the discharge of said housing, said blades having their leading edge portions disposed within said housing and having their end edges disposed in a conical plane of a pitch opposite to the pitch of said housing.

7. In a ventilating fan the combination of a conical housing having an air intake and an air discharge; and a plurality of air impelling blades mounted for rotation at the discharge of said housing, said blades having their trailing edge portions disposed outside said housing and having their end edges disposed in a conical plane of a pitch opposite to the pitch of said housing.

8. In a ventilating fan the combination of a conical housing having an air intake and an air discharge; and a plurality of air impelling blades mounted for rotation at the discharge of said housing, said blades having their leading edge portions disposed within said housing and having their trailing edge portions disposed outside said housing, said blades further having their end edges disposed in a conical plane of a pitch opposite to the pitch of said housing.

LYMAN C. REED. 

